Besides Ahluwalia, Mukesh met Cabinet Secretary K M Chandrasekhar and Principal Secretary in Prime Minister's Office T K A Nair, sources said.
On Wednesday, Anil called on prime minister and Power Minister Sushilkumar Shinde and a few others.
No comments, however, could be obtained from the spokespersons of either Reliance Industries Limited or of Anil Dhirubhai Ambani Group.
The two brothers are fighting a court battle over gas supply from Mukesh-led RIL to Anil Ambani group firm Reliance Natural Resources Ltd.
The government too has moved a petition in the case, while NTPC is separately fighting a gas dispute with RIL.
Image: Mukesh Ambani